<template>
	<view class="container">
		<!-- 空白页 -->
		<view v-if="!hasLogin || empty===true" class="empty">
			<image src="/static/emptyCart.jpg" mode="aspectFit"></image>
			<view v-if="hasLogin" class="empty-tips">
				空空如也
				<navigator class="navigator" v-if="hasLogin" url="../index/index" open-type="switchTab">随便逛逛></navigator>
			</view>
			<view v-else class="empty-tips">
				空空如也
				<view class="navigator" @click="navToLogin">去登陆></view>
			</view>
		</view>
		<view v-else>
			<!-- 列表 -->
			<view class="cart-list">
				<block v-for="(item, index) in cartList" :key="item.id">
					<view
						class="cart-item" 
						:class="{'b-b': index!==cartList.length-1}"
					>
						<view class="image-wrapper">
							<image :src="item.goods_info.cover_info.url"
								:class="[item.loaded]"
								mode="aspectFill" 
								lazy-load 
								@load="onImageLoad('cartList', index)" 
								@error="onImageError('cartList', index)"
							></image>
							<view 
								class="yticon icon-xuanzhong2 checkbox"
								:class="{checked: item.checked}"
								@click="check('item', index)"
							></view>
						</view>
						<view class="item-right">
							<text class="clamp title">{{item.goods_info.name}}</text>
							<text class="attr">{{item.attr_val}}</text>
							<text class="price">¥{{item.goods_info.price}}</text>
							<uni-number-box 
								class="step"
								:min="1" 
								:max="item.goods_info.number"
								:value="item.num>item.goods_info.number?item.goods_info.number:item.num"
								:isMax="item.num>=item.goods_info.number?true:false"
								:isMin="item.num===1"
								:index="index"
								@eventChange="numberChange"
							></uni-number-box>
						</view>
						<text class="del-btn yticon icon-fork" @click="deleteCartItem(index)"></text>
					</view>
				</block>
				<uni-load-more :status="loadMoreStatus"></uni-load-more>
			</view>
			<!-- 底部菜单栏 -->
			<view class="action-section">
				<view class="checkbox">
					<image 
						:src="allChecked?'/static/selected.png':'/static/select.png'" 
						mode="aspectFit"
						@click="check('all')"
					></image>
					<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">
						清空
					</view>
				</view>
				<view class="total-box">
					<text class="price">¥{{total}}</text>
				</view>
				<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
			</view>
		</view>
	</view>
</template>

<script>
	import { mapState, mapMutations } from 'vuex';
	import uniNumberBox from '@/components/uni-number-box.vue'
    import uniLoadMore from "@/components/uni-load-more"
	import { cart } from '../../common/config'

	export default {
		components: {
			uniNumberBox,
            uniLoadMore
		},
		data() {
			return {
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [],
                loadMoreStatus: 'more',
                requestData:{
                    page:1,
                }
			};
		},
		onShow(){
		    if(this.hasLogin) {
		        this.cartList = [];
                this.requestData.page = 1;
                this.loadData();
			}

		},
		onLoad(){

		},
        //上拉加载，需要自己在page.json文件中配置"onReachBottomDistance"
        onReachBottom(){
            this.loadMoreStatus = 'loading';
            this.loadData()
        },
		watch:{
			//显示空白页
			cartList(e){
				let empty = e.length === 0 ? true: false;
				if(this.empty !== empty){
					this.empty = empty;
				}
				if (e.length<10) {
				    this.loadMoreStatus = 'noMore';
				}
			}
		},
		computed:{
			...mapState(['hasLogin'])
		},
		methods: {
            ...mapMutations(['buyList']),
			//请求数据
			async loadData(){
                if (!this.hasLogin) {
                    return false;
				}
                let data = this.requestData;
				await this.$api.MyRequest(cart.GetShoppingCart.url, cart.GetShoppingCart.method, data)
                    .then(res => {
                        if (res.data.length != 0) {
                            this.requestData.page = res.current_page + 1;
                            let list = res.data;
                            list.map(item=>{
								item.checked = true;
								return item;
							});
                            this.cartList = this.cartList.concat(list);
                            this.loadMoreStatus = 'more'
                        }
                        else {
                            this.loadMoreStatus = 'noMore'
                        }
                    })
                    .catch(err => {
                    });
                this.calcTotal();  //计算总价
			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/errorImage.jpg';
			},
			navToLogin(){
				uni.navigateTo({
					url: '/pages/public/login'
				})
			},
			 //选中状态处理
			check(type, index){
				if(type === 'item'){
					this.cartList[index].checked = !this.cartList[index].checked;
				}else{
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item=>{
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			//数量
			async numberChange(data){
			    let requestData = {num: data.number};
			    this.$api.MyRequest(cart.PutShoppingCart.url + this.cartList[data.index].id, cart.PutShoppingCart.method, requestData)
                    .then(res => {
                        this.cartList[data.index].num = data.number;
                        this.calcTotal();
                    })
                    .catch(err => {
                    });
			},
			//删除
            async deleteCartItem(index){
				let list = this.cartList;
				let row = list[index];
				let id = row.id;
				await this.$api.MyRequest(cart.DeleteShoppingCart.url + id, cart.DeleteShoppingCart.method, {})
                    .then(res => {
                        this.cartList.splice(index, 1);
                        this.calcTotal();
                    })
                    .catch(err => {
                    });
			},
			//清空
			clearCart(){
			    let ids = [];
                ids = this.cartList.map((item) => {
                    return item.id;
				});
			    let data = {ids};
				uni.showModal({
                    title: '提示',
					content: '清空购物车？',
					success: (e)=>{
						if(e.confirm){
							this.requestClearCart(data);
						}
					}
				})
			},
			async requestClearCart(data){
                await this.$api.MyRequest(cart.DeleteShoppingCartAll.url, cart.DeleteShoppingCartAll.method, data)
                    .then(res => {
                        this.cartList = [];
                    })
                    .catch(err => {
                    });
			},
			//计算总价
			calcTotal(){
				let list = this.cartList;
				if(list.length === 0){
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item=>{
					if(item.checked === true){
						total += item.goods_info.price * item.num;
					}else if(checked === true){
						checked = false;
					}
				})
				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			createOrder(){
				let list = this.cartList;
				let sendData = [];
				list.forEach(item=>{
					if(item.checked){
						sendData.push(item)
					}
				});
				if (sendData.length === 0) {
				    this.msg('请先选择商品在去结算');
				    return;
				}
                this.buyList(sendData);
				// console.log(sendData);
                //跳转确认订单页面
                uni.navigateTo({
                    url:'../goods/confirmation'
                })
			}
		}
	}
</script>

<style lang='scss'>
	.container{
		padding-bottom: 134upx;
		/* 空白页 */
		.empty{
			position:fixed;
			left: 0;
			top:0;
			width: 100%;
			background: #fff;
			height: 100vh;
			padding-bottom:100upx;
			display:flex;
			justify-content: center;
			flex-direction: column;
			align-items:center;
			image{
				width: 240upx;
				height: 160upx;
				margin-bottom:30upx;
			}
			.empty-tips{
				display:flex;
				font-size: $font-sm+2upx;
				color: $font-color-disabled;
				.navigator{
					color: $uni-color-primary;
					margin-left: 16upx;
				}
			}
		}
	}
	/* 购物车列表项 */
	.cart-item{
		display:flex;
		position:relative;
		padding:30upx 40upx;
		.image-wrapper{
			width: 230upx;
			height: 230upx;
			flex-shrink: 0;
			position:relative;
			image{
				border-radius:8upx;
			}
		}
		.checkbox{
			position:absolute;
			left:-16upx;
			top: -16upx;
			z-index: 8;
			font-size: 44upx;
			line-height: 1;
			padding: 4upx;
			color: $font-color-disabled;
			background:#fff;
			border-radius: 50px;
		}
		.item-right{
			display:flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position:relative;
			padding-left: 30upx;
			.title,.price{
				font-size:$font-base + 2upx;
				color: $font-color-dark;
				height: 40upx;
				line-height: 40upx;
			}
			.attr{
				font-size: $font-sm + 2upx;
				color: $font-color-light;
				height: 50upx;
				line-height: 50upx;
			}
			.price{
				height: 50upx;
				line-height:50upx;
			}
		}
		.del-btn{
			padding:4upx 10upx;
			font-size:34upx; 
			height: 50upx;
			color: $font-color-light;
		}
	}
	/* 底部栏 */
	.action-section{
		/* #ifdef H5 */
		margin-bottom:100upx;
		/* #endif */
		position:fixed;
		left: 30upx;
		bottom:30upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690upx;
		height: 100upx;
		padding: 0 30upx;
		background: rgba(255,255,255,.9);
		box-shadow: 0 0 20upx 0 rgba(0,0,0,.5);
		border-radius: 16upx;
		.checkbox{
			height:52upx;
			position:relative;
			image{
				width: 52upx;
				height: 100%;
				position:relative;
				z-index: 5;
			}
		}
		.clear-btn{
			position:absolute;
			left: 26upx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 38upx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius:0 50px 50px 0;
			opacity: 0;
			transition: .2s;
			&.show{
				opacity: 1;
				width: 120upx;
			}
		}
		.total-box{
			flex: 1;
			display:flex;
			flex-direction: column;
			text-align:right;
			padding-right: 40upx;
			.price{
				font-size: $font-lg;
				color: $font-color-dark;
			}
			.coupon{
				font-size: $font-sm;
				color: $font-color-light;
				text{
					color: $font-color-dark;
				}
			}
		}
		.confirm-btn{
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $font-base + 2upx;
			background: $uni-color-primary;
			box-shadow: 0 20upx 40upx -16upx #fa436a;
		}
	}
	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked{
		color: $uni-color-primary;
	}
</style>
